Members of Gotham Whale spotted the massive marine mammal — nicknamed "Gotham" — swimming happily in the ocean off the Rockaways on Sunday.

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"We're so pleased," said Paul Sieswerda of Gotham Whale, which tracks whales in the areas around New York Harbor. "It was swimming normally and feeding. That makes it pretty clear that Gotham was a healthy whale simple chasing fish inside the harbor."

Experts had feared any whales that spend too much time in the crowded harbor could be injured by boats.

The whale watchers also made another important discovery on Sunday — the appearance of a right whale in the waters off the Rockaways.

"It's the most endangered of all the large whales," said Sieswerda. "It's unusual for them to come into the area around New York City."